QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

9km NW of Mariposa, CA

· 26 km deep · released about 88 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mariposa County 13 kmMadera County 45 kmTuolumne County 55 kmMerced County 70 kmStanislaus County 84 kmCalaveras County 85 kmFresno County 93 kmMono County 112 kmAmador County 114 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.3 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Mariposa County, 13 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3146 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 88 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 88 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 37.5337, -120.0518. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mariposa County, CA 13 km (8 mi) WSW of here earthquakes near Mariposa County
Madera County, CA 45 km (28 mi) NW of here earthquakes near Madera County
Tuolumne County, CA 55 km (34 mi) S of here earthquakes near Tuolumne County
Merced County, CA 70 km (44 mi) ENE of here earthquakes near Merced County
Stanislaus County, CA 84 km (52 mi) E of here earthquakes near Stanislaus County
Calaveras County, CA 85 km (53 mi) SSE of here earthquakes near Calaveras County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

54 earthquakes have been recorded within 50 km since this one.

  1. 2.0 8km WSW of Mariposa, CA
  2. 1.9 14km SSW of Bootjack, CA
  3. 2.3 10km W of Ahwahnee, CA
  4. 1.9 19km SSW of Bootjack, CA
  5. 3.0 13km S of Mariposa, CA
  6. 1.6 2km WNW of Yosemite Lakes, CA
  7. 1.6 10km S of Bootjack, CA
  8. 1.6 10km S of Bootjack, CA
  9. 1.9 10km SSE of Bootjack, CA
  10. 1.6 11km SSE of Bootjack, CA
  11. 2.3 14km S of Groveland-Big Oak Flat, CA
  12. 2.1 10km SSE of Bootjack, CA
  13. 2.0 9km SW of Mariposa, CA
  14. 1.6 10km W of Ahwahnee, CA
  15. 1.9 7km W of Yosemite Lakes, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.